<template>
    <div class="login_contaniner">
        <div class="login_box">
            <!-- 头像区 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单区 -->
            <div>
                <el-form ref="loginFormRef" :model="loginForm" label-width="0px" class="login_form" :rules="loginFormRules">
                    <!-- 用户名 -->
                    <el-form-item prop="username">
                        <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
                    </el-form-item>
                    <!-- 密码 -->
                    <el-form-item prop="password">
                        <el-input prefix-icon="el-icon-lock" v-model="loginForm.password" type="password"></el-input>
                    </el-form-item>
                    <!-- 登录按钮 -->
                    <el-form-item class="btns">
                        <el-button type="primary" @click="login">登录</el-button>
                        <el-button type="info" @click="resetLoginForm">重置</el-button>
                    </el-form-item>
                </el-form>
            </div> 
        </div>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 这是登录表单的数据对象
            loginForm:{
                username:'admin',
                password:'123456'
            },
            // 这是表单的验证规则
            loginFormRules:{
                // 验证用户名是否合法
                username:[ 
                    {required: true, message: '请输入登录名称', trigger: 'blur'},
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                // 验证密码是否合法
                password:[
                    {required: true, message: '请输入密码', trigger: 'blur'},
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
            }

        }
    },
    methods: {
        // 点击重置按钮，重置登录表单
        resetLoginForm() {
            // console.log(this);
            this.$refs.loginFormRef.resetFields()
        },
        login() {
            this.$refs.loginFormRef.validate(async valid=>{
                if(!valid) return
                const { data:res } = await this.$http.post('login',this.loginForm)
                if(res.meta.status !== 200) return this.$message.error('登录失败')
                this.$message.success('登录成功')
                // 1. 将登录之后的token，保存到客户端的 sessionStorage 中
                //      1.1 项目中出了登录之外的其他API接口必须再登录之后才能访问
                //      1.2 token 只应在当前网站打开期间有效，所以将token保存在sessionStorage
                // 2. 通过编程式导航跳转到后台主页面，路由地址是 /home
                window.sessionStorage.setItem('token',res.data.token)
                this.$router.push('/home')
            })
        }
    }
}
</script>

<style lang="less" scoped>
.login_contaniner{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    height: 300px;
    width: 450px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    .avatar_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow:0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
             width: 100%;
             height: 100%;
             border-radius: 50%;
             background-color: #eee;
        }
    }
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
.btns{
    display: flex;
    justify-content: flex-end;
}
</style>